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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c31518b1624c7d83e08ae3078a6d844e880a100efa7ae1196689c855bedef112' 
  AND token = 'AUtb0G08LNhyy7mk0Spx3c0/tCqH7MdraVEVx+9hGjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}